EP 0450866 A2 19911009 - Semiconductor capacitor circuit.
Title (en)
Semiconductor capacitor circuit.
Title (de)
Kapazitive Halbleiterschaltung.
Title (fr)
Circuit capacitif à semi-conducteurs.
Publication
Application
Priority
GB 9007492 A 19900403
Abstract (en)
This invention relates to semiconductor integrated circuits concerned with the realisation of different value capacitive components of a semiconductor chip by means of programming control arrangements. Programmable (IC) capacitors are implemented using a capacitive multiplier technique. Programmable capacitors comprise essentially three elements, a capacitor (C1) and one or two capacitor multipliers (M1 and M2). Capacitor (C1) is connected to the output of a first buffer circuit (B1) while programmable resistors (RP1 and RP2) are connected in series between the input and output of the buffer (B1), an output being taken from the junction between the first and second programmable resistors. By this arrangement of components, the ratio of the set values of the two programmable resistors (RP2 and RP1) determines the amount by which the capacitor (C1) value is multiplied. An overall effective capacitance value equal to (RP2/RP1) x C1 may be achieved. The final effective capacitance with two multipliers (M1, M2) approximates to (RP2/RP1) x (RP4/RP3) x C1. The value of programmable resistor RP1 is adjusted in accordance with an analogue reference signal (CCV) produced by a compensating circuit (Fig 2) to compensate for the manufacturing/processing variations of capacitor C1. <IMAGE>
IPC 1-7
IPC 8 full level
H01L 27/11 (2006.01); G11C 27/00 (2006.01); G11C 27/02 (2006.01); H01L 21/82 (2006.01); H01L 21/8244 (2006.01); H01L 27/10 (2006.01); H01L 27/118 (2006.01); H03H 11/04 (2006.01); H03H 19/00 (2006.01)
CPC (source: EP KR US)
G11C 27/00 (2013.01 - EP US); G11C 27/024 (2013.01 - EP US); G11C 27/026 (2013.01 - EP US); H01L 29/786 (2013.01 - KR)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0450866 A2 19911009; EP 0450866 A3 19920102; AT E140336 T1 19960715; AU 639543 B2 19930729; AU 7405191 A 19911010; CA 2039421 A1 19911004; CA 2039424 A1 19911004; CA 2039424 C 20020528; CN 1027199 C 19941228; CN 1055436 A 19911016; DE 69120707 D1 19960814; DE 69120707 T2 19961219; DK 0450863 T3 19961111; EP 0450863 A2 19911009; EP 0450863 A3 19920805; EP 0450863 B1 19960710; ES 2091869 T3 19961116; GB 2242801 A 19911009; GB 2242801 B 19940504; GB 2246666 A 19920205; GB 2246666 B 19940817; GB 9007492 D0 19900530; GB 9106497 D0 19910515; GB 9106562 D0 19910515; JP 3120182 B2 20001225; JP H05145038 A 19930611; JP H05175466 A 19930713; KR 100198206 B1 19990615; KR 910019220 A 19911130; KR 910019261 A 19911130; RU 2104601 C1 19980210; TW 205602 B 19930511; US 5196740 A 19930323
DOCDB simple family (application)
EP 91302730 A 19910327; AT 91302724 T 19910327; AU 7405191 A 19910403; CA 2039421 A 19910328; CA 2039424 A 19910328; CN 91102044 A 19910403; DE 69120707 T 19910327; DK 91302724 T 19910327; EP 91302724 A 19910327; ES 91302724 T 19910327; GB 9007492 A 19900403; GB 9106497 A 19910327; GB 9106562 A 19910327; JP 7119891 A 19910403; JP 7119991 A 19910403; KR 910005268 A 19910402; KR 910005269 A 19910402; SU 4895018 A 19910402; TW 80105527 A 19910716; US 67948391 A 19910402